Arrangement for synchronizing pendulum clocks with the aid of existing telephone lines



Sept. 3, W2 v1,553,787

A. MAYER ARRANGEMENT FOR SYNGHRONIZING PENDULUM CLOCKS WITH THE AID OF EXISTING-TELEPHONE LINES Filed June 9, 1923 Patented Sept. 15, 1925,

istsgsz PATENT OFFICE.

ARMANI) MAYER, OF LEVALLOIS-PERRET, FRANCE.

ARRANGEMENT FOR SYNGI-IRONIZING PENDULUM CLOCKS WITH THE AID OF EXISTING TELEPHONE LINES.

Application filed June 9, 1923. Serial No. 644,352.

T 0 all whom it may concern:

Be it known thatI, ARMAND MAYER, a citizen of the French Republic, residing at Levallois-Perret, France, have invented certain new and useful Improvements in Arrangements for Synchronizing Pendulum Clocks with the Aid of Existing Telephone Lines, for which I have filed an application for patent in France on June 14, 1922, and of which the following is a specification.

This invention relates to synchronizing apparatus for pendulum clocks in connection with telephone lines, and the'object of the invention is to enable the ordinary telephone lines of central battery telephone systems to be used in the control of synchronous pendulums on the subcribers premises by means of a master pendulum kept by the exchange.

The accompanying drawing shows the synchronizing apparatus applied to a telephone line worked by a central battery 16. The line 1 is permanentlyconnected to one terminal of the central battery 16 and is connected to the return line 2 at the subscribers end through a condenser 23 and call bell 24, the condenser and call bell being shunted by the telephone 25 when the re 'ceiver is lifted, by means of a switch 26 as usual. y

A soft iron armature 21 is normally held in contact with a contact member 19 by means of a spring 22, so that the circuit of the telephone line 1 is normally closed through the armature 21, contact 19 and the winding of the electro-ma-gnet 17. A second clcctro-magnet 18 adapted to pull the armature 21 in the opposite direction is supplied with current from a battery28 through an interrupter 27 which alternately opens and closes the circuit every half second, under the control of a master pendulum 10. When the circuit of the magnet 18 is closed the armature 21 is pulled away from the contact 19 and brought into contact with a contact member 20 connected through a resistance 29 to the telephone line 1.

At the receiving station a synchronizing coil 5 associated with a synchronous pendulum in the known manner is connected across the lines 1 2 in series with the alarm bell 21 and condenser 23, a condenser 9 being connected across the synchron z ng coil in order to facilitate the passage of the call current.

The operation is as follows 2-- When the telephone line is not in use the armature 21 is moved into contact with contact member 20 every time the magnet 18 is excited and thus contacts alternately with the contact members 19, 20. \Vhen the armature comes into contact with the member 19 .the lines 1 and 2 are connected through the central battery 16 whereby the alternating current of one cycle per second passes through the synchronizing coil 5 thus synchronizing the pendulum associated therewith in the well-known manner.

Vhen the telephone line is in use the circuit of the central battery is closed by the switch 26 and continuous current flows through the line. This current passes through the winding of the magnet 17 and holds the-armature 21 in contact with the contact member 19 throughout the time during which the telephone line is in use, the pull of the magnet 18,bcing insufficient to move the armature against the pull of the magnet 17. A condenser 30 connected between; the armature 21 and one end of the winding of the magnet 17 shunts the wind ing of the magnet 17 and forms a by-pass for the speech currents.

I claim A, synchronizing apparatus for pendulum clocks in connection with telephone lines with central battery comprising in combination a telephone line, an armature, an armature contact, an electro-magnet at one Side of saidarmature contact, a sub-pendulum, a coil of said sub-penduluni and a condenser in series with said coil, and a central battery in said telephone line sending a synchronizing current into said coil through the intermediary of said magnet armature contact and condenser, a resistance ahead of said condenser, a second armature contact connected therewith, a magnet on the other rection as the first mentioned synchronizing side of said armature, and a main pendulum current, and a condenser in parallel with sending every half a second a current imthe magnet on the battery side designed pulse into said second mentioned magnet for to prevent the access of the telephone curattracting said armature to said second conrents to said battery magnet.

tact so that the said condenser discharges In testimony whereof I afiix my signature. through said resistance, sending into said coil a synchronizing current of opposite di- ARMAND MAYER. 

